Lower SDK minimums to iOS 8.0 and macOS 10.9

These are the versions currently supported by Themis. While we can
definitely bump them up to iOS 10.0 and macOS 10.14 somewhere in 2020,
let's keep them matching Themis requirements for now.

Author: ilammy

assets/MacOSX/Info.plist

@@ -19,6 +19,6 @@
 	<key>CFBundleVersion</key>
 	<string>1</string>
 	<key>MinimumOSVersion</key>
-	<string>10.11</string>
+	<string>10.9</string>
 </dict>
 </plist>

assets/iPhone/Info.plist

@@ -19,6 +19,6 @@
 	<key>CFBundleVersion</key>
 	<string>1</string>
 	<key>MinimumOSVersion</key>
-	<string>11.0</string>
+	<string>8.0</string>
 </dict>
 </plist>

build-libssl.sh

@@ -34,9 +34,9 @@ DEFAULTARCHS="ios_x86_64 ios_arm64 tv_x86_64 tv_arm64 mac_x86_64 watchos_armv7k
 DEFAULTTARGETS="ios-sim-cross-x86_64 ios64-cross-arm64 ios64-cross-arm64e tvos-sim-cross-x86_64 tvos64-cross-arm64 macos64-x86_64 watchos-cross-armv7k watchos-cross-arm64_32 watchos-sim-cross-i386"
 
 # Minimum iOS/tvOS SDK version to build for
-IOS_MIN_SDK_VERSION="12.0"
+IOS_MIN_SDK_VERSION="8.0"
 TVOS_MIN_SDK_VERSION="12.0"
-MACOS_MIN_SDK_VERSION="10.15"
+MACOS_MIN_SDK_VERSION="10.9"
 WATCHOS_MIN_SDK_VERSION="4.0"
 
 # Init optional env variables (use available variable or default to empty string)

create-openssl-framework.sh

@@ -67,15 +67,15 @@ if [ $FWTYPE == "dynamic" ]; then
         elif [[ $PLATFORM == AppleTV* ]]; then
             MIN_SDK="-tvos_version_min 11.0"
         elif [[ $PLATFORM == MacOSX* ]]; then
-            MIN_SDK="-macosx_version_min 10.11"
+            MIN_SDK="-macosx_version_min 10.9"
         elif [[ $PLATFORM == iPhoneSimulator* ]]; then
-            MIN_SDK="-ios_simulator_version_min 11.0"
+            MIN_SDK="-ios_simulator_version_min 8.0"
         elif [[ $PLATFORM == WatchOS* ]]; then
             MIN_SDK="-watchos_version_min 4.0"
         elif [[ $PLATFORM == WatchSimulator* ]]; then
             MIN_SDK="-watchos_simulator_version_min 4.0"
         else
-            MIN_SDK="-ios_version_min 11.0"
+            MIN_SDK="-ios_version_min 8.0"
         fi
 
         #cd $TARGETDIR